They are 43 and 1 because it is a Prime number
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43 is a prime number, only 1 and 43 can go into it
2 can go into 38 and 100 evenly.
These are all the whole numbers that go into 129 evenly: 1, 3, 43, 129.
It is a prime number and therefore no number but 1 and 41 can go into it evenly.
7 and 31 go into 217 evenly.